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From: "Rumburg, William" <wrumburg@cdicorp.com>
To: "'Mike S. Reinath'" <mreinath@mail.arc.nasa.gov>, 
	lancair.list@olsusa.com
Subject: RE: Oil cooling
Date: Thu, 16 Mar 2000 12:40:15 -0500
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>>
>  I thought the 320 and 360 had a thermal valve that metered 
> oil to the oil cooler. Doesn't this valve stop the oil flow to the 
> oil cooler when the oil temp is below a certain value preventing too 
> much cool air through the oil cooler from being a problem?
> 
	Mike -
	I had the same question as you three years ago. 
	There's an expensive little device known as a Vernitherm in your
engine. I also thought it's purpose is to maintain a minimum oil temperature
by opening and closing as necessary to restrict oil flow through the oil
cooler, similar to the radiator thermostat in your automobile. I don't know
what the Vernitherm does, but it doesn't maintain a minimum oil temperature.
I found that out when I started flying and my oil temperatures would not go
above 160 degrees, even during repeated touch and go's during a warm day. I
then installed a pilot-adjustable throttle in my oil cooler air intake and
now have complete temperature control.
	I couldn't even get an answer from Don George as to why the
Vernitherm doesn't maintain a minimum oil temperature. 
	If you don't install a system to throttle air flow to your oil
cooler, you're in for a surprise.
	Bill Rumburg
	N403WR  (Sonic bOOm)



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